ACLS

AXCELIS TECHNOLOGIES

$139.99+8.97 (+6.85%)

Closing price as of May 1, 2026

3 superinvestors own ACLS

Based on latest 13F filings — data is 45–90 days delayed

Investor	Fund	Weight	Shares	Value	Quarter	Activity
Donald Smith & Co	Donald Smith & Co	1.50%	2,282,471	$62.4M	2017Q3	Reduced
Bill Nygren	Oakmark Select Fund – Harris Associates	0.30%	41,614	$481K	2001Q1	New
First Eagle Investment Management	First Eagle Investment Management	0.02%	136,318	$11.0M	2025Q4	Added

Open-market purchases (P) and sales (S) from SEC Form 4 filings · last 12 months

No open-market insider trades in the last 12 months.

Form 4 filings for option exercises and other transaction types are excluded.

STOCK Act disclosures · last 12 months

Congressional trade data coming soon.

We are sourcing STOCK Act disclosures and will display them here shortly.

What Is SEC Form 4?

Understand the insider trade filings behind ACLS activity.

What Is a 13F Filing?

How superinvestors disclose their quarterly holdings.

Insider Cluster Buying

Why multiple insiders buying together is a strong signal.

Superinvestor Consensus

The most widely held stocks across all tracked institutions.